JPS60150555A - Nonaqueous electrolyte cell - Google Patents

Abstract

PURPOSE:To suppress an increase of the inner resistance at the later period of discharging and improve the discharge characteristic by adding indium trisulfide to a positive electrode using iron disulfide as the active material. CONSTITUTION:A pellet molded by pressure with the positive electrode black mix made by adding acetylene black as conductive agent and fluororesin powder as binding agent to a mixture of iron disulfide and indium trisulfide then thoroughly mixing them is burnt at a temperature of 200-300 deg.C to form a positive electrode 1. A punched lithium rolled plate is used for a negative electrode 4. In addition, a mixed solvent of propylene carbonate and 1,2dimethoxyethane solved with lithium perchlorate, for example, is used as the electrolyte. Accordingly, an increase of the inner resistance at the later period of discharging is suppressed, and the discharge characteristic is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a non-aqueous electrolyte battery using iron disulfide as a positive electrode active material.

(b) Prior art Lithium, sodium or their alloys are used as negative electrode active materials, metal oxides, sulfides, chlorides and halide carbons are used as positive electrode active materials, zoL-1 pyrene carbonate,
Nonaqueous electrolyte batteries that use an electrolyte prepared by dissolving inorganic salts such as perchlorate lithium 1, lithium borofluoride, and aluminum lithium 11 in an organic solvent such as r-butyl lactone or 1.2 dimethoxyethane have a high Because it has the advantage of having high energy density and low self-discharge,
In recent years, it has attracted particular attention, and to date, 3 and 10 OV-based non-aqueous electrolyte batteries have been proposed that use di-manganese oxide or back-fluorinated element as positive electrode active materials.

For example, if iron disulfide (FeS2) is used as the positive electrode active material as disclosed in Japanese Patent Publication No. 56-36794, a 1.5V non-aqueous electrolyte battery can be obtained, which can replace the existing It has the advantage of being able to replace dry batteries and alkaline batteries.

(c) Purpose of the Invention The present invention specifically aims to improve the battery characteristics of a 1,5V non-aqueous solution battery using iron disulfide as a positive electrode active material.

(d) Structure of the invention The present invention comprises a negative electrode using lithium, sodium, or an alloy of these as an active material, a positive electrode using binary f iron as an active material, and a non-aqueous electrolyte, A non-aqueous electrolyte battery characterized in that indium trisulfide is added to the positive electrode.

(e) Examples Examples of the battery of the present invention will be described in detail below.

Commercially available iron disulfide (FeS2) = indium sulfide, (I
Approximately 1 ton of positive electrode mixture was prepared by adding 10% acetylene blank as a conductive agent and 5% fluororesin powder as a binder to a mixture of 4% 10% n2S3) and mixing thoroughly. Pressure molded at cTn2 pressure, diameter 15.0m
, a bedding sheet with a thickness of 11 mm is obtained, and then this bedding is fired at a temperature of 200 to 300° C. to form a positive electrode.

□The negative electrode was made by rolling a lithium plate to a thickness of 0.6 plates, and punching out this rolled plate to a diameter of 15.0111 m. In addition, for 7 nights of electrolysis, 1 mol/p of lithium perchlorate "71" was added to a mixed solvent of propylene carbonate and 12 methane
, dissolved.

FIG. 1 shows a cross-sectional view of the battery of the present invention, in which (1) is the positive electrode, which is pressed into contact with the inner bottom surface of the positive electrode can (2) via the positive electrode current collector (3). is the negative electrode and the negative electrode can (5
) is crimped onto the inner bottom surface of the negative electrode current collector (6). (7) is a separator made of polypropylene nonwoven fabric;
(8) is insulation puffing.

Figure 2 shows the battery of the present invention (A) and the conventional battery (B) at 20 degrees.
This is a comparison of the discharge characteristics and internal resistance characteristics when discharging at a constant load of 5.6 Ω at C.

Note that indium trisulfide has not been added to the iron disulfide positive electrode of the conventional battery (B).

As is clear from Section 2, the rise in internal resistance in the late stage of discharge was suppressed in the battery of the present invention (A> compared to the conventional battery CB), and the discharge characteristics were improved. Recognize.

Considering the reason for this, in the case of conventional German batteries, the internal resistance increases due to an increase in discharge products after discharge, either because the reason is unknown or because of an increase in discharge products after discharge. On the other hand, in the case of the battery of the present invention, indium disulfide as an additive participates in the reaction in the late stage of discharge, and the reaction product of indium trisulfide and indium trisulfide causes an increase in the internal resistance of the positive electrode. It is thought that it acts in a suppressive manner.

The amount of indium trisulfide added must be at least 1.0% by weight or more based on the positive electrode type (■), otherwise the effect will be insufficient, and if it is added over 30.0% by weight, it will become the main active material in the positive electrode. It should be avoided as it reduces the photometer of iron disulfide.

Therefore, indium mosulfide should have a weight of 11.0 to 300 relative to the weight of the electrode, and 1+ and H degrees.

stomach.

(・＼) Effect of the invention 4 In the invented battery, trisulfide in/ram was added to the positive electrode which uses iron disulfide as the active material, so the increase in internal resistance in the late stage of release was suppressed and the discharge characteristics were improved. In particular, it is extremely valuable for the conversion of 1.5V non-aqueous electrolyte batteries, which have a voltage of 1.5 V, which is almost the same as the upper battery voltage of existing walkaline dry batteries. .

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the battery of the present invention, and FIG. 2 is a graph showing the battery characteristic ratio V between the battery of the present invention and a conventional battery. (1)... Positive electrode, (2)... Positive electrode can, (3) ・
Positive electrode current collector, (4) negative electrode, (5)...negative electrode can, (6)
... Negative electrode current collector, (7>... Separate, 18)
Insulating backing, (A) ・Battery of the present invention, (B) ・
Conventional battery. Applicant Pieyo Denki Co., Ltd. Agent Patent Attorney Shizuo Sano

Claims (1)

[Claims] ■ A negative electrode using lithium, sodium, or an alloy thereof as an active material, a positive electrode using iron disulfide as an active material, and a non-aqueous electrolyte, and indium trisulfide is added to the positive electrode. 1. A non-aqueous electrolyte battery whose characteristics are: